Condemn Sader Need Aoe Dmg

Hey guys. I've been trying to get higher in my greater rifts but I seem to get stuck around 15-18 because my single target damage is way too low. I can kill packs of mobs just fine but as soon as the rift guardian appears it takes 3 minutes to kill him, and I run into the same problem if I get an extra health yellow mob with nothing around to use my shield glare or my taunt on to get extra wrath, as well as when I get unlucky with a map that isn't very dense. I was wondering if there is a different build I should use to help with my single target or if I'm just SoL as a lightning crusader.
http://us.battle.net/d3/en/profile/M../hero/52222196
I know, I don't have sockets in any of my jewelry. I'm working on it If I did have sockets, I'd be using my rank 9 wreath of lightning (it just works so well with my build imo). I'm not sure what other two gems I'd use - maybe the smite one and the increased damage after using my a primary skill? I'm only saying that because I use my primary a LOT to generate wrath when I don't have tons of mobs around me.
Anyway, any help would be appreciated. Thank you
Edit: I usually duo with a monk that is more single target orientated so we've been doing t3 and t4 normal rifts and bounties just fine as well, Idk if that information would make a difference or not.